Detailed explanation of php registration tree

* Registration tree: In fact, it is to create an object set, also called an object pool, which is stored in an array.

//Declare three classes first, and then throw them into the object tree

class Demo1 {}
class Demo2 {}
class Demo3 {}

//Declare the object registration tree class

class Register
{
    //静态属性中保存着所有已经挂载到树上的对象
    public static $objs = [];
    
    //将对象挂载到树上
    public static function set($index,$obj)
    {
        self::$objs[$index] = $obj;
    }
    
    //取出对象使用
    public static function get($index)
    {
        return self::$objs[$index];
    }
    
    //已经无效的对象,及时销毁,节省资源
    public static function del($index)
    {
        unset(self::$objs[$index]);
    }
}

//First instantiate the three classes and then mount them on the object tree

Register::set('demo1',new Demo1);
Register::set('demo2',new Demo2);
Register::set('demo3',new Demo3);

//Check whether the tree is on the tree?

var_dump(Register::$objs);
echo &#39;<hr>&#39;;
echo &#39;<pre class="brush:php;toolbar:false">&#39;.print_r(Register::$objs,true).&#39;

'; echo '

---

';

//Use the get method of the registered class to view

var_dump(Register::get('demo2'));

//Delete an instance object in the object pool

Register::del('demo2');

//View the demo2 object again, it can no longer be Checked it because it was destroyed

var_dump(Register::get('demo2'));

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